Reversing-valve.



J. w. BEL L.

REVBRSIN G VALVE.

APPLICATION FILED AUG. 10,1907.

, 920,524. PamentedMay ,1909.

- ATTORNEYS WITNESSES THE NORRIS PETER! cc, WSHINGTON, 17.17.

"unrrnn err-rains ratrnnr oisnron JOHNW. BELL, OF SHENANDOAH, PENNSYLVANIA.

RE VERSING-VALVE.

Specification of Letters Patent Patented May 4, 1909.

structed that when the reversin valve is closed it completely shuts off all communication between the pressure chamber, back of the reversing valve, and the cylinder, with the exhaust ports leading from the chambers at the ends of the slide valve, thus preventing a loss of power from the cylinder through a reverse valve chamber, which latter feature stops all interference with the operation of the slide valve and auxiliary plunger therefor when used, by reason of counter-pressure -leaking from the back of the reverse valve.

A further purpose of the invention is to provide a construction of reversing valve that will effectually act to close the ports to which it is adapted, no matter what the wear of the parts may be.

The invention consists in the novel construction and combination of the several parts as will be hereinafter fully set forth and pointed out in the claims.

Reference is to be had to the accompanying drawings forming a part of this specification in which similar characters of reference indicate corresponding parts in both the ligures.

Figure 1 is a vertical section through the steam cylinder and chest of a steam pump, and a section through the applied reversing valve; and Fig. 2 is an enlarged vertical section through the valve and easing.

Although I have shown the reversing valve applied to a steam pump of the Cameron type, I desire it to be understood that said valve may be applied with equally good results to any type of steam engine.

A represents a piston driven by steam admitted under a slide valve B in the steam chest B, which as it is shifted backward and forward alternately connects with opposite ends of the cylinder 0 through the medium of the ports 10 and 11 that act alternately as supply and exhaust ports for the cylinder. The slide valve in the construction set forth is shifted by a plunger B This plunger is hollow and is filled with steam that passes out through. a hole at each end and fills the spaces 12 and. 13 between it and the heads of the steam chest in which it works. Pressure being equal at each end of the plunger B it is, under ordinary conditions, balanced and motionless, but when the steam piston A. has traveled far enough to strike and open a re versing valve D, to be hereinafter particularly described, the steam exhaust passes through a port E, one of which leads from each of said spaces 12 and 1.3, causing the plunger to immediately shift and carry with it the valve B, thus reversing the stroke of the piston A. No matter in what direction the piston is traveling, it must instantly reverse on touching the valves D. The plunger B in its movement acts as a slide valve to close the ports E, and is cushioned on the confined steam between the ports and steam chest cover.

The reversing valves D are closed as soon as the piston A leaves them, by a constant pressure of steam entering behind them through ports 14 that lead from the steam chest through the casings D for the valves. The casings D may be integral portions of the cylinder C or may be attached thereto in any suitable manner. Each casing D provided with a chamber D and this chamber D is provided with a cylindrical outer section 15 and an intermediate conical section 16, which latter section at its reduced end portion connects with a cylindrical section 16*, that is much smaller in diameter than the rear cylindrical section 15. W here a casing D engages the cylinder 0, it is sometimes desirable to have stepped keys 17 formedtherein as extensions from the central portion of the inner face of the casing, as is shown in the drawings, but the said step ed keys 17 may be omitted. When used they constitute bearings for the inner ends of .the valves D operating in said easings.

Each valve D corresponds in exterior contour to the interior contour of the casing or valve chamber D that is to say, each valve D consists of a rear cylindrical section 18 of sufiicient size and length to move freely in the cylindrical section 15 of the valve chamber D and a conical intermediate section 19, at the reduced end of which a cylindrical stem section 20 is formed integral with the body portion of the valve, and in the closed exhaust port ii is carried portion of the conical section 16 of the valve chamber and thence to the exhaust port for the steam chest, is shown by dotted lines in the drawings.

it will be o bserved that the CODE/Ll sect-ion of a valve when the valve is in closed L I T I crosses the ports E and i ano aaving tapering connection with the walls o'li also the valve so its in the cl'ieniber D as to prevent any fluid passing out except when the valve is pushed outward to its open. position for the passage of cXl'lilllSt steam through the ports E, ii, and Such a vrve will wear period of time, but in perfectly for a long order to compensate for possible wear, rings r JI y J H 1 Jil, hi are nttet in grooves pioouceu in LulO periphery of the inner cylindrical section l8 7 of the valve, as is also shown in the drawin s,

and these rings ill correspond to the ordine y steam peel-ring ringzgs. Each casing or hushing D is provided. at its outer end with a 1 detachable cap D winch adi'nits oi the ready withdrawal oi a valve from s casin or the 27w niitroduction ot a valve therein.

In the construction described, when the reversing valve is closed it completely struts oil all commui'iicntion between the pressure chamber back of the reversing valve and the cylinder, with the ports E, E, and E thus preventing a loss of power from the cylinderthrough. the release velve exhaust and the escape of pressure into th port it from the pressure chamber bncl; ol the reversing valve. This latter l e ture stops all interference with the operation of the plunger B by the accumulation of counter-"oressure leaking from the heck oi the rel .ase lve.

Having thus described. my invention, 1

claim as new and desire to secure by Letters Patent;-

1. A combination with a cylinder, piston in the cylinder, a steam chest, slide valve in the steam chest, and a plunger l'or from the bottom 5 tabhshing colnnninication between the outer '1 ition chamber D eli'ectually closes said poi-ts, and 1 operating the valve, of casings at the ends of the cylinder, eech casing being provided with a chamber having an outer cylindrical section, an inner cylindrical section smaller than the outer section, and an intermediate conical section, said chan'iber being provided with ports leading from the upper portions cl? their conical sections to the ends of the steam chest, ports leading from. the lower portions of said conical portions to the exhaust port of the steam chest, and ports essectiops or the chambers and the steam chest intermediate oi the ends thereof, and 'slves having cylindrical outer sections,

= inner cylindrical sections smaller than the outer sections and intermediate conical sections, said valves be ng n'iounted in the said chambers and having their smaller inner ends projecting into the cylinder.

2. in reversing valves, the combination with a casing having a chamber constructed with a r- 1r cylindrical section, a forward or inner cylindrical section of lesser diameter than the rear section, and an ii'itcrvening conical section, the said casing being also provided with an exhaust port leading from its upper portion to the upper part oi the he cheniber, being in con1- inunicetion therewith, and a second exhaust port communicating with and leading from the lower part of the conical section of the said valve cheniber, of n valve mounted to slide in the said chanib-e", vhich valve coniprises e rear cylindrical section provided with an inserted peripheral ring, or rings, an inner cylindrical section of lesser diaineter, and an intermediate or intervening conical section, the latter section being adapted to cross the por wl'iere they enter the valve ch n'iber, we said valve in its external con tour corresponding to the contour ol the said valve chamber, and the said valve in its in ner or smaller c lindrical section Being oif' sullicient strength. to extend out beyond the easing into the main cylinder when the valve is in closcd'position.

in testimony whereof I heve signed my name to this specification in the presence of two subscribing witne. ses.

JOHN w. Blllil'l. 

